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10
107+x = 12
10
107+x = 120
x = 120-107
x = 13
ditanyakan = nilai x?
mean = jumlah/banyaknya data
12 = (7+8+12+8+10+15+18+14+15+x) / 10
12 = 107+x /10
107+x = 12 . 10
107+x = 120
x = 120 - 107
x = 13